LINUX COMMANDS

• COPY
  • cp index.js node-server/ to the directory
  • cp index.js main.js to the current directory
• Restart: sudo reboot
• Update-Upgrade sudo apt-get update sudo apt-get upgrade
• Switch User su - afozbek
• User Add useradd afozbek-simple
  • adduser afozbek
• List Users nano /etc/passwd
• Delete User deluser —remove-home newuser
• Add Password to User passwd afozbek-simple
• Add SSH KEY sudo nano ~/.ssh/authorized_keys
• Change SSH Config sudo nano /etc/ssh/sshd_config
• Enable Firewall sudo ufw enable
  • List sudo ufw app list
    • • Nginx Full: This profile opens both port 80 (normal, unencrypted web traffic) and port 443 (TLS/SSL encrypted traffic)
    • Nginx HTTP: This profile opens only port 80 (normal, unencrypted web traffic)
    • Nginx HTTPS: This profile opens only port 443 (TLS/SSL encrypted traffic)
• Look for System is Working Properly
  • sudo systemctl status sshd
  • sudo systemctl restart ssh
• Look Memory Usage
  • free -h
  • vmstat -s

NGINX (LIKE APACHE) - Reverse Proxy

What is a Reverse Proxy Server? | NGINX

• Stop sudo systemctl stop nginx
• Restart service nginx restart
• Start sudo systemctl start nginx
  • Default HTML location: /var/www/html
• /etc/nginx: The Nginx configuration directory. All of the Nginx configuration files reside here.
• /etc/nginx/nginx.conf The main Nginx configuration file. This can be modified to make changes to the Nginx global configuration.
  • Access Log: /var/log/nginx/access.log
  • Error Log: /var/log/nginx/error.log
• /etc/nginx/sites-available/: The directory where per-site “server blocks” can be stored. Nginx will not use the configuration files found in this directory unless they are linked to the sites-enabled directory (see below).
• /etc/nginx/sites-enabled/: The directory where enabled per-site “server blocks” are stored.
• /etc/nginx/snippets: This directory contains configuration fragments that can be included elsewhere in the Nginx configuration.

PM2

PM2 - Single Page Doc

• pm2 stop app_name_or_id
• pm2 list
• pm2 info app
• To Start All instance on startup pm2 startup ubuntu

Nano

1. CTRL + 6 for Mark Set and mark what you want (the end could do some extra help).
2. ALT + 6 copy selected line
3. CTRL + K for cutting what you want to copy
4. CTRL + U for pasting what you have just cut because you just want to copy.
5. CTRL + U at the place you want to paste.

DOCKER

How To Install and Use Docker on Ubuntu 18.04 | DigitalOcean

1. Add User to Docker Group sudo usermod -aG docker username
2. Check User is in the Docker Group id -nG
3. To view system-wide information about Docker, use: docker info
4. Find and download(if not exist) an image from Docker Hub: docker run {image}
   1. Ex: docker run hello-world
5. Search and list images : docker search {image}
   1. Ex: docker search ubuntu
6. Run a Container and switch to the interactive terminal(-it)
   1. docker run -it ubuntu
7. Listing containers
   1. List running containers docker ps
   2. List stopped containers docker ps -f “status=exited”
   3. List all containers docker ps -a
   4. View latest container docker ps -l
8. Start or Stop a container with its containerId
   1. docker start {containerId}
   2. docker stop {containerId}
9. Remove a container with its containerId or name
   1. docker rm {containerId}
   2. docker rm {name}
10. Remove an image with its imageId or name
    1. docker rmi {imageId}
    2. docker rmi {name}
11. Start a container with giving a custom name with —name
    1. docker run --name newName {imageName}
12. Manage your changes
    1. Commit: docker commit -m "added Node.js" -a "{userName}" {containerId} "{userName}"/{newImageName}
    2. Push docker push {userName}/{imageName}
13. Listing the Docker images - (You can see your new image there 😁)
    1. docker images
14. Login to Docker Hub
    1. docker login -u {docker-registry-username}